Fix linux tutorial: cloning example policies and set of default policies for a node (#295) (#296)

* clone policies to temporary dir as subversion hack doesnt work anymore

* add get_type_description service to policies

* update MacOS similarly

* update all permissions with new topics

* dont rule out cycloneDDS

* example of enclave override

Signed-off-by: Mikael Arguedas <mikael.arguedas@gmail.com>
Co-authored-by: Chris Lalancette <clalancette@gmail.com>
(cherry picked from commit ca6bb12c)

Co-authored-by: Mikael Arguedas <mikael.arguedas@gmail.com>